| River Forest to Oakleaf Plantation (Florida) | 875.91 mi (1,409.65 km) |
| River Forest to Oakley (California) | 1,802.68 mi (2,901.13 km) |
| River Forest to Oakton (Virginia) | 590.68 mi (950.61 km) |
| River Forest to Oakville (Missouri) | 272.28 mi (438.19 km) |
| River Forest to Oatfield (Oregon) | 1,741.49 mi (2,802.66 km) |
| River Forest to Ocala (Florida) | 934.09 mi (1,503.27 km) |
| River Forest to Ocean Acres (New Jersey) | 722.55 mi (1,162.83 km) |
| River Forest to Ocean City (New Jersey) | 716.12 mi (1,152.48 km) |
| River Forest to Ocean Pines (Maryland) | 711.00 mi (1,144.25 km) |
| River Forest to Ocean Pointe (Hawaii) | 4,247.63 mi (6,835.90 km) |
| River Forest to Ocean Springs (Mississippi) | 795.48 mi (1,280.19 km) |
| River Forest to Oceanside (California) | 1,712.32 mi (2,755.71 km) |
| River Forest to Oceanside (New York) | 740.89 mi (1,192.35 km) |
| River Forest to Ocoee (Florida) | 985.29 mi (1,585.67 km) |
| River Forest to Oconomowoc (Wisconsin) | 90.06 mi (144.94 km) |
